iPhone Filesystem or CLI access

I saw an article on CNN today that says the Starbucks iOS app stores the username and password unencrypted, and all a hacker would need is a laptop, and iphone the user left behind.

I have the starbucks app on my iPhone and wanted to see it first hand. I tried using Putty and Windows Explorer to connect to my iPhone with no luck.

I also read that you would need to install OpenSSH to connect to an iPhone over WiFi, but to install OpenSSH, you would need to jailbreak the phone (that's what I read).

Question:
How do I connect to the command line or filesystem of the iPhone without jailbreaking it. More specifically, how do I get access to this file:
/Library/Caches/com.crashlytics.data/com.starbucks.mystarbucks/session.clslog

Certain apps allow you access to some iPhone directories, but nothing allows full filesystem access.

Although the password is in cleartext, you need access to the phone system. Apple blocks that by default. So unless your iPhone is hacked you can't get to it.
And to hack a phone a physical connection is required.

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